CMPI or imbalance/lactose overload

I have a 3m old who was previously pooing once every week, thickish yellow stools no mucous. I consume dairy and soy daily. Since about 2 weeks she has developed mucousy/watery, sometimes foamy stools, twice she has had small flecks of blood. She has about 5-10 a day. I have since had my first period and have noticed a shift in supply (a marked increase) which has me leaking again on the opposite breast whilst feeding. The initial milk from that breast is often very water. My question is, I have eliminated dairy for a week with no real improvement. She has no other symptoms apart from the ones listed?